Cri-du-chat. Babies with the cry of the cat syndrome have a cry which sounds like that of a cat in distress: because the infant's larynx is improperly developed. The cause of this condition is a deletion of about half of the short arm of chromosome number five. Cri-du-chat babies are severely mentally retarded, round face, low set ears, heart disease, and have a small cranium. The incidence of this syndrome is 1/1,000,000 live births. Karyotype: 46XX or 46 XY with one chromosome #5 upper arm deletion.
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